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Calculate T, log10 fO2 at specified Pressure

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Specify pressure and olivine, spinel and orthopyroxene compositions:

Leave input temperature set to zero to calculate a temperature from olvine-spinel equilibrium and a log10 fO2 from olvine-spinel-orthopyroxene equilibrium. Alternately, input a temperature to calculate a log10 fO2 from olvine-spinel-orthopyroxene metastable exchange equilibrium at the specified temperature and pressure.

Olivine Spinel Orthopyx
Oxide Wt% Wt% Wt% Intensive Variables
SiO2
T (C)
TiO2
P (GPa)
Al2O3
Fe2O3
Cr2O3
FeO
MnO
MgO
NiO
CoO
CaO
Na2O
T, log fO2

Calculations are based upon thermodynamic models developed in the following papers:

  • Sack RO, Ghiorso MS (1989) Importance of considerations of mixing properties in estab­lishing an internally consistent database: Thermochemistry of minerals in the system Mg2SiO4-Fe2SiO4-SiO2. Contrib Mineral Petrol 102, 41-68
  • Sack RO, Ghiorso MS (1994) Thermodynamics of multicomponent pyroxenes: I. Formulation of a general model. Contrib Mineral Petrol  116, 277-286
  • Sack RO, Ghiorso MS (1994) Thermodynamics of multicomponent pyroxenes: II. Phase relations in the quadrilateral. Contrib Mineral Petrol  116, 287-300
  • Sack RO, Ghiorso MS (1994) Thermodynamics of multicomponent pyroxenes: III. Calibration of Fe2+(Mg)-1, TiAl(MgSi)-1, TiFe3+(MgSi)-1, AlFe3+(MgSi)-1, NaAl(CaMg)-1, Al2(MgSi)-1 and Ca(Mg)-1 exchange reactions between pyroxenes and silicate melts. Contrib Mineral Petrol 118, 271-296
  • Sack, RO, Ghiorso, MS (1991) An internally consistent model for the thermodynamic properties of Fe-Mg-titanomagnetite-aluminate spinels. Contrib Mineral Petrol 106, 474-505
  • Sack, RO, Ghiorso, MS (1991) Chromian spinels as petrogenetic indicators: thermody­namics and petrological applications. Am Mineral 76, 827-847

 

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